I pulled out my 2 780s (sli) and installed my new 1080, and get only a blank screen, and incomplete boot, or I assume so because just a simple touch of the power button shuts it down, no holding the button for 6 seconds. Stick one of the 780s back in, and it comes right up. Although I downloaded the 1080 driver, I can't do anything with the install because it can't find a 1080. Can anyone offer me some advice on where I'm going wrong? Thanks! zz03